How to Reset Mercedes-Benz VGS4 NAG2 Gearbox Using Launch X431 ECU Programmer
How to Virginize Mercedes-Benz VGS4 NAG2 Gearbox Using Launch X431 ECU Programmer
With the release of the V10.40 update, the Launch X431 ECU Programmer now allows users to virginize Mercedes-Benz VGS4 NAG2 transmission control units. Here’s a step-by-step guide on how to do it.
V10.40 Update Overview
Release Date: January 13, 2025
Supported Devices:
Launch X-431 ECU/TCU Programmer
X-prog3 and PC Adapter
Launch X431 Smartlink Scanner (Pro5/PAD V/PAD VII) with X-prog3
New Features:
Added Read, Write, Personalization and Clear functions for BOOT mode in Benz VGS4-0-NAG2 and VGS4-500-NAG2.
Enhanced Capability for Cadillac, Chevrolet, Great Wall and Geely ECUs.
Function Description
The process will virginize the 4th generation 7-speed Mercedes-Benz gearbox. After erasing the TCU, it is programmable and adaptable to the vehicle using MB Star Diagnosis for replacement purposes.
Step-by-Step Instructions to Virginize Benz VGS4 NAG2 Gearbox
Step 1: Select ECU Model

Using the Launch X431 ECU Programmer, select the gearbox type: VGS4-0-NAG2 or VGS4-500-NAG2


Step 2: Check the Wiring Diagram


Follow the wiring diagrams on the software: select either BENCH mode-read data from an original TCU or BOOT mode-erase or personalize an external TCU. Step 3: Connect to, and then Read TCU Info Connect the tool with the vehicle’s TCU using the diagram. Click to read the TCU information in order to check the connection. Step 4: Read EEPROM Data
Read the EEPROM data from the original vehicle’s TCU using BENCH mode.
If impossible to read in BENCH mode, change immediately to BOOT mode in order to read the data.
Step 5: Erase External TCU


Connect the external (used) TCU when the original TCU data has been read.
Make sure both BENCH and BOOT modes are connected simultaneously.
Click “Erase” to restore the external TCU to its default settings.
Step 6: Write EEPROM Data


Select to personalize the external TCU.
Enter EEPROM data from an original car to the TCU.
Step 7: Check Personalization

If personalization is successful, then reread the information of the TCU for confirmation of a reset.
Step 8: Install and Program the TCU



Install the TCU back in the car. Programming and adaptation are made through MB Star Diagnosis.
Advantages of Virginization Process
Provides easy reutilization of second-hand TCUs.
Saves complicated disassembly when replacing a TCU.
Easy programming and adaptation for Mercedes-Benz gearboxes.
Thus, this feature provides a lot of value to professionals dealing with Mercedes Benz models, making the Launch X431 ECU Programmer indispensable.
Let me know if you’d like to add more details or tweak anything further!
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